I'm going to go see M:I3 because I love Lost and like what I've seen of Alias. Don't particularly care for Tom Cruise, and I never saw the first two, but that's okay. It looks good, and the word-of-mouth is pretty strong.
I personally have no problem with Cruise, couldn't care less about his dopey personal life. And SOMEONE likes his movies, the way they haul in the cash.
As for JJ Abrams, I don't watch TV but he seems like a smart, creative man. But if he makes Ben Affleck Captain Kirk (and I ain't even a Trekkie), he's clearly losing it.